Lifetime measurements of states of , , , and using the AGATA -ray tracking spectrometer
- University of the West of Scotland, Paisley (United Kingdom); Scottish Universities Physics Alliance (SUPA) (United Kingdom)
- Université Larbi Tébessi, Tébessa (Algeria)
- University of Strasbourg (France); Centre National de la Recherche Scientifique (CNRS), Strasbourg (France)
- Laboratori Nazionali di Legnaro, Padova (Italy)
- Florida State University, Tallahassee, FL (United States); TRIUMF, Vancouver, BC (Canada)
- Universitá degli Studi di Padova (Italy); Istituto Nazionale di Fisica Nucleare, Sezione di Padova (Italy)
- University zu Koln (Germany)
- University of the West of Scotland, Paisley (United Kingdom); Scottish Universities Physics Alliance (SUPA) (United Kingdom); Horia Hulubei National Institute for R&D in Physics and Nuclear Engineering (IFIN-HH), Bucharest (Romania)
- University Paris-Sud, Orsay (France); Université Paris-Saclay, Orsay (France)
- Universidad de Salamanca (Spain); University of Liverpool (United Kingdom)
- University of Florence (Italy)
- Institute Laue-Langevin, Grenoble (France)
- Ruder Bošković Institute, Zagreb (Croatia)
- Université Paris-Saclay, Orsay (France)
- Laboratori Nazionali di Legnaro, Padova (Italy); University of Oslo (Norway)
- Indian Inst. of Technology (IIT), Ropar (India)
Lifetimes or lifetime limits of a small number of excited states of the sulfur isotopes with mass numbers A = 35 , 36, 37, and 38 have been measured using the differential recoil-distance method. The isotopes of sulfur were populated in binary grazing reactions initiated by a beam of 36S ions of energy 225 MeV incident on a thin 208Pb target which was mounted in the Cologne plunger apparatus. The combination of the PRISMA magnetic spectrometer and an early implementation of the AGATA γ-ray tracking array was used to detect γ rays in coincidence with projectile-like nuclear species. Lifetime measurements of populated states were measured within the range from about 1 to 100 ps. The number of states for which lifetime measurements or lifetime limits were possible was limited by statistics. For 35S, the lifetime was determined for the first 1/2+ state at 1572 keV; the result is compared with a previous published lifetime value. The lifetime of the 3- state of 36S at 4193 keV was determined and compared with earlier measurements. No previous lifetime information exists for the (6+) state at 6690 keV; a lifetime measurement with large associated error was made in the present work. For 37S, the states for which lifetime limits were established were those at 646 keV with Jπ = 3/2- and at 2776 keV with Jπ = 11/2-; there are no previously published lifetime values for excited states of 37S. Finally, a lifetime limit was established for the Jπ =(6+) state of 38S at 3675 keV; no lifetime information exists for this state in the literature. Measured lifetime values were compared with the results of state-of-the-art shell-model calculations based on the PSDPF, SDPF-U, and FSU effective interactions. In addition, nuclear magnetic-dipole and electric-quadrupole moments, branching ratios, mixing ratios, and electromagnetic transition rates, where available, have been compared with shell-model values. The current work suffers from poor statistics; nevertheless, lifetime values and limits have been possible, allowing a useful discussion of the ability of state-of-the-art shell-model calculations to reproduce the experimental results.
- Research Organization:
- Florida State Univ., Tallahassee, FL (United States)
- Sponsoring Organization:
- USDOE Office of Science (SC), Nuclear Physics (NP); Science and Technologies Facility Council (STFC); National Science Foundation (NSF); Natural Sciences and Engineering Research Council of Canada (NSERC); Croatian Science Foundation
- Grant/Contract Number:
- SC0009883; ST/L005808/1; ST/P005101/1; PHY-1712953
- OSTI ID:
- 1979897
- Journal Information:
- Physical Review. C, Vol. 106, Issue 2; ISSN 2469-9985
- Publisher:
- American Physical Society (APS)Copyright Statement
- Country of Publication:
- United States
- Language:
- English
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